When I towed my empty trailer to the scales the weight of my trailer is around 800 pounds. I lost 2 mpg and I was using my overdrive. So you towing with a somewhat loaded trailer with a new engine getting 11-12 mpg isn't shocking.

a gas engine can never compare to a diesel in terms of towing.
with gas you'll always be winding it out and kicking it down.
diesel has superb low end torque which allows it to stay in top gear at times that a gas engine will drop to 3rd even.
that said, i have been hauling my 3000 lb race car and gear with my hemi and hardly notice it behind me (probably around 5k lbs total).

a gas engine can never compare to a diesel in terms of towing.
with gas you'll always be winding it out and kicking it down.
diesel has superb low end torque which allows it to stay in top gear at times that a gas engine will drop to 3rd even.
that said, i have been hauling my 3000 lb race car and gear with my hemi and hardly notice it behind me (probably around 5k lbs total).

Or just shift it your self. I think the tow/haul button is useless with cars that has the autostick. Buying the Hemi to tow 2-3K pounds worth of stuff would just be a waste. Save that for places with a lot of hills or more heaver loads IMO

Under normal situations, the V6 is supposed to be around 9-10 L/100 Kms.
20 L/100 Kms is terrible... thats what my H2 gets right now under normal driving.
I too have a snowmobile trailer that I will be towing two 600 E-TEC's, so I hope those numbers change big time... or i might have to consider something else to replace my H2.